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Efficiency analysis of an energy conversion system for a variable speed small hydropower plant

机译：变速小水电站能量转换系统的效率分析

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Present-day Small Hydropower Plants (SHPs) have a large development potential because of the increasing interest in renewable resources and distributed energy generation. However, the variable hydrological conditions that are found in the run-of-the-river projects require operations over a wide range of water flow and head variations. Special control methods and system topologies are needed to maintain the high efficiency of energy conversion systems. The synchronous generator excited by permanent magnets (PMSG) characterizes higher and more stable efficiency characteristic, in relation to the generated power, then mostly used in SHPs asynchronous machine. This paper investigates the efficiency of an example SHP solution. The researched system is based on an innovative generation unit (hydro-set) containing a propeller turbine integrated with the PMSG. In order to obtain the high efficiency in a wide range of water flow the variable speed operation method has been used. This solution requires a Power Electronic Unit in the energy conversion system to match the load and control the power flow from the generator to the grid. Efficiency analysis concerns all elements of the energy conversion system. Presented results comes from the real SHP of 150kW nominal power.
机译：由于对可再生资源和分布能源产生的兴趣日益增加，当今小水电站（SHPS）具有很大的发展潜力。然而，在河流项目中发现的可变水文条件需要在各种水流和头部变化上进行操作。需要特殊控制方法和系统拓扑以维持能量转换系统的高效率。由永磁体（PMSG）激发的同步发电机特征在于与所产生的电源相关，然后在SHPS异步机中使用较高且更稳定的效率特性。本文研究了示例性SHP解决方案的效率。研究系统基于包含与PMSG集成的螺旋桨涡轮机的创新发电单元（水电站）。为了在宽范围的水流中获得高效率，已经使用了变速操作方法。该解决方案需要在能量转换系统中的电力电子单元以匹配负载并控制从发电机到网格的电流。效率分析涉及能量转换系统的所有元素。出现的结果来自150kW标称力量的真实SHP。

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